aloha_from_bradley
Autocross Champion
- Location
- AZ
I would just monitor for KR in the days before an oil change. If youre running 91/93 on an equivalent tune, your KR shouldn’t be more than -3, -4 at the worst. If it’s consistently pulling, or has worse spikes than -3/-4, I would change plugs then monitor again.
If you are pulling negative 4s, you need to have your tune dialed back. Way too much spark / timing being added if this is the case. Or you need better gas.